Method and system for cyclic emission reduction of carbon monoxide in sintering flue gas

Abstract

The invention discloses a sintering flue gas carbon monoxide circulation emission reduction method and system, and belongs to the technical field of industrial environmental protection, and the method comprises the following steps: S1, pre-treating a part of sintering flue gas to remove fine particulate matters, sulfur dioxide and nitrogen oxide pollutants, and cooling the sintering flue gas; the residual sintering flue gas is subjected to catalytic reduction, and the concentration of carbon monoxide in the sintering flue gas is reduced; s2, the sintering flue gas is subjected to oxygen-enriched combustion; and S3, heat energy of the sintering flue gas is recycled. According to the invention, carbon monoxide in the residual flue gas is recovered through a gas separation technology, and is re-injected into the system as fuel supplement, so that cyclic utilization and resourceful treatment of the flue gas are realized. Therefore, the resource waste is reduced, the carbon emission is reduced, and the concept of sustainable development is met; technical parameters of wet-type electric precipitation and oxygen-enriched combustion are dynamically adjusted according to flue gas characteristics and expected heat energy recovery efficiency, and optimal operation of the system under different working conditions is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of industrial environmental protection, and particularly relates to a method and system for circulating and reducing carbon monoxide emissions from sintering flue gas. Background Art

[0002] During the iron and steel production process, sintering flue gas is an important pollution source. It not only contains harmful pollutants such as high-concentration CO, but also contains a certain amount of waste heat resources. In the long-process iron and steel smelting process, the flue gas generated in key production links such as coking, iron ore sintering, reduction rotary kiln, and rotary hearth furnace is the main source of CO emissions in the iron and steel industry flue gas. Especially in the sintering process, it occupies the position of a "disaster area" in the atmospheric pollutant emissions of iron and steel integrated enterprises. According to data, the CO emissions from the sintering machine head account for 22% of the total CO emissions of the steel plant, and the original concentration of CO emissions in the sintering flue gas is usually between 8000 and 10000 milligrams per cubic meter. Considering the total amount of CO emitted by national iron and steel sintering machines every year, its negative impact on the environment is huge.

[0003] In past treatment methods, sintering flue gas was usually treated as waste, lacking effective resource utilization methods. This not only led to the waste of potential energy resources but also further increased the environmental burden. Therefore, developing and applying new technologies to convert pollutants and waste heat in sintering flue gas into useful resources is of great significance for realizing the green and sustainable development of the iron and steel industry. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a method and system for circulating and reducing carbon monoxide emissions from sintering flue gas, which converts pollutants and waste heat in sintering flue gas into useful resources to solve the problem that in the prior art, sintering flue gas is often treated as waste, lacking means of resource utilization, which not only wastes potential energy resources but also causes further burden on the environment.

[0005] The first object of the present invention is to provide a method for circulating and reducing carbon monoxide emissions from sintering flue gas, including the following steps:

[0006] S1. Pretreat part of the sintering flue gas to remove fine particulate matter, sulfur dioxide, and nitrogen oxide pollutants, and at the same time cool down the sintering flue gas; catalytically reduce the remaining sintering flue gas to reduce the carbon monoxide concentration therein;

[0007] S2. Conduct oxygen-enriched combustion on the sintering flue gas;

[0008] S3. Recover the heat energy of the sintering flue gas.

[0009] Preferably, S1 includes: pretreating part of the sintering flue gas by using wet electrostatic precipitation technology, and cooling and reducing the temperature of the sintering flue gas by using water mist.

[0010] Preferably, according to the pollutant concentration and temperature in the sintering flue gas, control the particle size, injection volume and injection frequency of the water mist in the wet electrostatic precipitation technology.

[0011] Preferably, S1 includes: catalytically reducing the remaining sintering flue gas to reduce the concentration of carbon monoxide and other pollutants therein, and calculating the catalytic oxidation efficiency; recovering the carbon monoxide in the sintering flue gas through gas separation technology and re-injecting it into S2 as fuel supplement.

[0012] Preferably, detect the sintering flue gas after catalytic reduction, and when it meets the environmental protection requirements, discharge the remaining sintering flue gas.

[0013] Preferably, S2 includes: injecting pure oxygen into the sintering flue gas to promote the combustion of unburned carbon monoxide and other combustible components in the sintering flue gas, and at the same time increasing the flue gas temperature.

[0014] Preferably, S3 includes: introducing the sintering flue gas after oxygen-enriched combustion treatment into a waste heat recovery device to realize the recovery and utilization of heat energy.

[0015] Preferably, after oxygen supplementation, the incremental heat energy E of the circulating flue gas recycle，oxygenated is calculated by the following formula:

[0016]

[0017] wherein, E thermal is the incremental heat energy; m start and m end respectively represent the starting mass and the ending mass for calculating the incremental heat energy; C p is the specific heat capacity of the flue gas, indicating the heat absorbed by unit mass of flue gas when the temperature rises by 1 degree Celsius; T final (m) and T initial (m) respectively represent the final temperature and the initial temperature of the flue gas at mass m.

[0018] Preferably, the calculation formula for the catalytic oxidation efficiency is as follows:

[0019]

[0020] wherein, η CO，oxidation is the catalytic oxidation efficiency of carbon monoxide in the emission reduction flue gas; V emit is the volume of the flue gas discharged after catalytic oxidation treatment; [CO] emit is the concentration of carbon monoxide in the discharged flue gas; V in is the volume of the flue gas input into the catalytic oxidation device; [CO]in is the concentration of carbon monoxide in the input flue gas; k is the reaction rate constant of the catalytic oxidation reaction; A is the contact area between the flue gas and the catalyst; t is the time of the catalytic oxidation reaction; V reac t is the reaction volume of the catalytic oxidation reaction; η CO，oxidation The closer the value of η is to 1, the higher the catalytic oxidation efficiency of carbon monoxide and the better the emission reduction effect.

[0021] The second object of the present invention is to provide a sintering flue gas carbon monoxide recycling emission reduction system for realizing the above-mentioned sintering flue gas carbon monoxide recycling emission reduction method. The system includes:

[0022] a wet electrostatic precipitator, an oxygen-enriched combustion device, a waste heat recovery device, a catalytic reduction device and a gas separation device;

[0023] a control system for dynamically adjusting the working conditions of the wet electrostatic precipitator, the oxygen-enriched combustion device and the catalytic reduction device according to the real-time parameters of the flue gas discharged from the sintering machine, so as to optimize the emission reduction effect and the heat energy recovery efficiency;

[0024] a monitoring device for real-time monitoring of the concentration and temperature parameters of pollutants in the flue gas to ensure that the finally discharged flue gas meets the environmental protection requirements.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] By applying advanced catalytic reduction technology, the present invention effectively recovers the carbon monoxide component from the discharged flue gas and re-injects the recovered carbon monoxide into the system for use as a fuel supplement. This process not only realizes the recycling of flue gas, but also converts the originally potentially wasted resources into valuable fuels, thus achieving the purpose of resource treatment. In this way, we not only reduce the dependence on and consumption of natural resources, but also significantly reduce carbon emissions, which fully conforms to the concept of sustainable development and is of great significance for saving resources and protecting the environment.

[0027] In the present invention, the parameter settings of the wet electrostatic precipitation technology and the oxygen-enriched combustion technology are dynamically adjusted according to the specific characteristics of the flue gas and the expected heat energy recovery efficiency. This dynamic adjustment ensures that the entire system can maintain the optimal operating state under different working conditions. The flexibility of the system means that it can easily adapt to various different production requirements while meeting the increasingly strict environmental protection standards and requirements, providing an efficient and environmentally friendly solution for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic flow chart of a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0030] As Figure 1 shown:

[0031] Embodiment 1: The present invention provides a method for cyclic reduction and emission reduction of carbon monoxide in sintering flue gas, including the following steps:

[0032] S1. Pretreat a part of the sintering flue gas to remove fine particulate matter, sulfur dioxide and nitrogen oxide pollutants, and at the same time cool down the sintering flue gas; catalytically reduce the remaining sintering flue gas to reduce the carbon monoxide concentration therein;

[0033] The present invention innovatively applies the wet electrostatic precipitation technology to effectively pretreat the flue gas discharged from the sintering machine. This process mainly aims at removing harmful pollutants such as fine particulate matter, sulfur dioxide and nitrogen oxides in the flue gas. Through a carefully designed wet electrostatic precipitation system, these pollutants can be effectively captured, thus purifying the flue gas. In addition, the wet electrostatic precipitation technology also utilizes the cooling effect of water mist to further reduce the temperature of the flue gas, so as to obtain pretreated circulating flue gas with a suitable temperature.

[0034] For the remaining part of the flue gas discharged from the sintering machine, the present invention also takes advanced treatment measures. The catalytic reduction technology is adopted to deeply treat the pollutants in the remaining flue gas, especially to effectively reduce the carbon monoxide therein, and at the same time calculate the catalytic oxidation efficiency. In this process, through specific gas separation technology, the carbon monoxide in the remaining flue gas can be recovered. These recovered carbon monoxide gases are then re-injected into the treatment process of the sintering machine as a supplement to the fuel, thus realizing the cyclic utilization and resource treatment of the flue gas. This innovative method not only ensures that the finally discharged flue gas can meet strict environmental protection standards, but also significantly reduces carbon emissions, which is of great significance for saving resources and protecting the environment.

[0035] S2. Carry out oxygen-enriched combustion on the sintering flue gas;

[0036] The present invention injects an appropriate amount of high-purity oxygen into the pretreated flue gas. In this way, it can effectively promote the efficient combustion of unburned carbon monoxide and other combustible components in the flue gas. In addition, this technology can also synchronously increase the temperature of the flue gas, so as to achieve the purpose of improving the combustion efficiency and thermal efficiency.

[0037] S3. Recover the heat energy of the sintering flue gas.

[0038] The high-temperature circulating flue gas treated by the oxy-fuel combustion technology can be effectively introduced into the waste heat recovery device, thereby realizing the recovery and reuse of heat energy;

[0039] Based on the above preferred embodiments, the following optimization techniques can also be adopted:

[0040] In the application process of the wet electrostatic precipitation technology, the particle size, injection volume, and injection frequency of the water mist are crucial parameters, and these parameters need to be dynamically adjusted according to the concentration of pollutants in the flue gas and the temperature of the flue gas. Through such adjustments, the dust removal efficiency can be effectively improved, and at the same time, the cooling effect can be enhanced to ensure the efficient and stable operation of the entire system.

[0041] In the implementation process of the oxy-fuel combustion technology, the precise control of the purity, injection volume, and combustion conditions of oxygen is the key to achieving efficient combustion. These control parameters need to be carefully adjusted according to the specific composition, temperature of the circulating flue gas, and the expected heat energy recovery efficiency. Through precise control, the combustion process can be optimized, the energy utilization efficiency can be improved, and at the same time, the emission of harmful substances can be reduced.

[0042] The heat energy increment E of the circulating flue gas after oxygen supplementation thermal is calculated by the following formula:

[0043]

[0044] where E thermal is the heat energy increment; m start and m end respectively represent the starting mass and the ending mass for calculating the heat energy increment; C p is the specific heat capacity of the flue gas, indicating the heat absorbed by a unit mass of flue gas when the temperature rises by 1 degree Celsius; T final (m) and T initial (m) respectively represent the final temperature and the initial temperature of the flue gas at mass m;

[0045] The specific application process of the above formula is as follows:

[0046] 1. Determine the mass range

[0047] Determine the mass range by measuring the flue gas flow rate and time entering the combustion chamber. When the flue gas flow rate is stable, the mass range can be calculated by the flow rate and time.

[0048] 2. Measure or calculate the specific heat capacity C p

[0049] The specific heat capacity C pIt is an important physical property of flue gas and depends on the composition, temperature, and pressure of the flue gas. In practical applications, the specific heat capacity can be obtained through experimental measurements or by referring to relevant literature. For the flue gas in oxy-fuel combustion technology, its composition may be different from that of the flue gas generated by ordinary air combustion, and the specific heat capacity data for oxy-fuel combustion flue gas can be specifically measured or referred to.

[0050] 3. Determine the initial temperature and the final temperature

[0051] The initial temperature T initial (m) and the final temperature T final (m) are functions that vary with the mass m. During the oxy-fuel combustion process, due to the injection of oxygen and the occurrence of combustion reactions, the temperature of the flue gas will change. Therefore, it is necessary to accurately measure or calculate these temperature values. This can be achieved by installing temperature sensors at different positions in the combustion chamber.

[0052] 4. Conduct integral calculations

[0053] After determining the mass range, specific heat capacity, and initial and final temperatures, substitute these values into the formula for integral calculations. The integral process is actually to accumulate the thermal energy changes at each mass point, thereby obtaining the total thermal energy change within the entire mass range.

[0054] 5. Interpret and apply the results

[0055] Finally, it is necessary to interpret and apply the calculation results. The thermal energy increment E thermal is used to evaluate the energy conversion efficiency of the oxy-fuel combustion technology and provide data support for thermal energy recovery and utilization. For example, the thermal energy increment can be compared with the amount of oxygen and fuel input to calculate the thermal efficiency; or the thermal energy increment can be used to drive other thermal energy conversion devices, such as steam turbines, heat pumps, etc.

[0056] For the waste heat recovery device, a waste heat boiler can be selected.

[0057] As can be seen from the above, the present invention first uses wet electrostatic precipitator technology to pre-treat the flue gas, effectively removes the pollutants therein, and can reduce the temperature of the flue gas. In this way, the harmful substances in the flue gas are effectively removed, and at the same time, favorable conditions are created for the subsequent treatment steps. Next, the method adopts oxygen-enriched combustion technology to inject high-purity oxygen into the pre-treated flue gas. This process not only promotes the efficient combustion of combustible components such as carbon monoxide in the flue gas, but also significantly increases the temperature of the flue gas, providing higher thermal efficiency for subsequent heat recovery. Subsequently, the high-temperature circulating flue gas treated with oxygen-enriched combustion is introduced into the waste heat boiler, and the heat energy in the flue gas is converted into usable heat energy through heat recovery technology, thereby realizing efficient utilization of energy. For the remaining flue gas that has not been completely treated in the above process, the present method further adopts catalytic reduction technology to reduce the concentration of pollutants therein. In addition, through gas separation technology, carbon monoxide in the flue gas can be recovered and used as a fuel supplement, which not only reduces pollution to the environment, but also realizes the recycling and resource treatment of flue gas. During the implementation process, the technical parameters of wet electrostatic precipitator and oxygen-enriched combustion will be dynamically adjusted according to the specific characteristics of the flue gas and the desired heat recovery efficiency to ensure the efficient operation of the entire system. The heat energy increment of the circulating flue gas after oxygen supplementation can be calculated by a specific formula. The larger the value, the more beneficial the heat energy supplement to the sintering machine is, thereby improving the thermal efficiency of the entire sintering process. The present invention not only ensures that the final flue gas emissions fully meet environmental protection requirements, but also significantly reduces carbon emissions, realizes the effective emission reduction and resource utilization of sintering flue gas, and has important environmental protection significance and economic benefits.

[0058] Embodiment 2: This embodiment is basically the same as the previous embodiment, except that catalytic reduction technology is used to treat flue gas that is not directly involved in the circulation to further reduce the concentration of pollutants.

[0059] Specifically, in step 4, the calculation formula of the catalytic oxidation efficiency is as follows:

[0060]

[0061] Among them, η CO，oxidation To reduce the catalytic oxidation efficiency of carbon monoxide in flue gas; V emit is the volume of flue gas discharged after catalytic oxidation treatment; [CO] emit is the concentration of carbon monoxide in the exhaust gas; V in is the flue gas volume input to the catalytic oxidation device; [CO] in is the concentration of carbon monoxide in the input flue gas; k is the reaction rate constant of the catalytic oxidation reaction; A is the contact area between the flue gas and the catalyst; t is the time of the catalytic oxidation reaction; V react is the reaction volume of the catalytic oxidation reaction; η CO，oxidationThe closer the value is to 1, the higher the catalytic oxidation efficiency of carbon monoxide and the better the emission reduction effect;

[0062] The specific application process of the above formula is as follows:

[0063] Identify each parameter in the formula and measure or estimate it accurately. The parameters include:

[0064] Input flue gas volume V in : It can be measured in real time through instruments such as flow meters. During the sintering process, the volume of the flue gas may fluctuate with the change of production conditions, so continuous monitoring is required.

[0065] Input carbon monoxide concentration [CO] in the flue gas in : It can be measured through instruments such as gas analyzers. The carbon monoxide concentration is an important indicator for evaluating the degree of flue gas pollution and is also the basis for calculating the catalytic oxidation efficiency.

[0066] Emission flue gas volume V emit : Accurate data can be obtained by monitoring the flow rate of the emission flue gas.

[0067] Carbon monoxide concentration [CO] in the emission flue gas emit : This is the concentration of carbon monoxide in the flue gas after catalytic oxidation treatment and is also a key indicator for evaluating the catalytic oxidation efficiency.

[0068] Catalytic oxidation reaction rate constant k: This is a constant related to conditions such as catalyst type, temperature, and pressure. It can be obtained through experimental determination or by referring to relevant literature.

[0069] Contact area A between the flue gas and the catalyst: Depends on the shape, size, and arrangement of the catalyst. To obtain higher catalytic oxidation efficiency, it is usually necessary to increase the contact area between the flue gas and the catalyst.

[0070] Catalytic oxidation reaction time t: This is the time the flue gas stays in the catalyst bed and is also an important factor affecting the catalytic oxidation efficiency. The reaction time can be controlled by adjusting the flue gas flow rate and the length of the catalyst bed.

[0071] Catalytic oxidation reaction volume V react : It is the volume of the catalyst bed and is a factor affecting the catalytic oxidation efficiency. The catalytic oxidation efficiency can be improved by increasing the volume of the catalyst bed.

[0072] Calculation of catalytic oxidation efficiency

[0073] After identifying the above parameters, the formula can be used to calculate the catalytic oxidation efficiency. The specific steps are as follows:

[0074] Measurement parameters: First, use the corresponding instrument to measure the volume V of the input flue gas in and the concentration [CO] in , as well as the volume V of the discharged flue gas emit and the concentration [CO] emit .

[0075] Calculate the concentration integral: According to the integral part in the formula, calculate the integral values of the carbon monoxide concentrations in the input flue gas and the discharged flue gas. It can be achieved by numerical integration methods

[0076] Substitute into the formula for calculation: Substitute the measured parameter values and the calculated concentration integral values into the formula to calculate the catalytic oxidation efficiency η CO，oxidation .

[0077] Result analysis and optimization

[0078] After obtaining the catalytic oxidation efficiency, analyze it, and optimize the catalytic oxidation process according to the analysis results. The specific steps are as follows

[0079] Evaluate the efficiency: First, evaluate whether the catalytic oxidation efficiency has reached the expected goal. If the efficiency is low, measures such as adjusting the catalyst type, increasing the contact area, and extending the reaction time may need to be considered to improve the efficiency

[0080] Optimize the parameters: According to the evaluation results, each parameter in the catalytic oxidation process can be optimized. For example, control the reaction time by adjusting the flue gas flow rate, or increase the reaction rate constant by replacing with a more efficient catalyst, etc

[0081] Continuous monitoring and adjustment: Since the working conditions during the sintering process may change, it is necessary to continuously monitor the catalytic oxidation efficiency and adjust the parameters according to the actual situation to ensure that the catalytic oxidation process is always in the best state

[0082] Through the above steps, we can apply the above formula to the carbon monoxide cyclic emission reduction in sintering flue gas and achieve the calculation and optimization of the catalytic oxidation efficiency. This not only helps to reduce the pollution degree of sintering flue gas, but also can improve the energy utilization efficiency, achieving a win-win situation for environmental protection and economic benefits

[0083] As can be seen from the above, this embodiment adds a step of catalytic reduction treatment to the flue gas that does not directly participate in the cycle to further reduce its pollutant concentration; in the catalytic reduction step, the emission reduction effect of carbon monoxide can be accurately evaluated through the catalytic oxidation efficiency calculation formula; this formula takes into account multiple factors such as the volume of the discharged flue gas, the concentration of carbon monoxide, the volume of the input flue gas, the input concentration of carbon monoxide, the catalytic oxidation reaction rate constant, the contact area between the flue gas and the catalyst, the reaction time, and the reaction volume; the closer the value of the catalytic oxidation efficiency is to 1, the better the emission reduction effect of carbon monoxide; this improvement not only enhances the comprehensiveness of flue gas treatment, but also ensures the reliability and high efficiency of the emission reduction effect through accurate evaluation of the catalytic oxidation efficiency, further promoting the optimization and development of sintering flue gas emission reduction technology.

[0084] Embodiment 3: A sintering flue gas carbon monoxide cyclic emission reduction system includes,

[0085] a wet electrostatic precipitator, an oxygen-enriched combustion device, a waste heat recovery device, a catalytic reduction device, and a gas separation device;

[0086] a control system for dynamically adjusting the working conditions of the wet electrostatic precipitator, the oxygen-enriched combustion device, and the catalytic reduction device according to the real-time parameters of the flue gas discharged from the sintering machine to optimize the emission reduction effect and the heat energy recovery efficiency;

[0087] a monitoring device for real-time monitoring of the concentration and temperature parameters of pollutants in the flue gas to ensure that the finally discharged flue gas meets the environmental protection requirements.

[0088] As can be seen from the above, this system is equipped with a wet electrostatic precipitator, an oxygen-enriched combustion device, a waste heat recovery device, a catalytic reduction device, and a gas separation device; in addition, the system also includes a control system that can dynamically adjust the working conditions of each device according to the real-time parameters (such as pollutant concentration and temperature) of the flue gas discharged from the sintering machine, thereby optimizing the emission reduction effect and the heat energy recovery efficiency; at the same time, the monitoring device is used to real-time monitor the pollutant concentration and temperature parameters in the flue gas to ensure that the finally discharged flue gas strictly meets the environmental protection standards; the design and application of this integrated system not only improve the efficiency of sintering flue gas treatment, but also significantly enhance the emission reduction effect, providing an innovative and efficient solution for the field of industrial flue gas treatment.

[0089] In the attached drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved, and other structures can refer to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0090] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for reducing emissions by recycling carbon monoxide in sintering flue gas, characterized in that, Including: S1. Pretreat part of the sintering flue gas to remove fine particulate matter, sulfur dioxide and nitrogen oxide pollutants, and at the same time cool down the sintering flue gas; Catalytically reduce the remaining sintering flue gas to reduce the carbon monoxide concentration therein; S2. Carry out oxygen-enriched combustion on the sintering flue gas; S3. Recover the heat energy of the sintering flue gas.

2. The sintering flue gas carbon monoxide circulation emission reduction method according to claim 1, characterized in that S1 includes: Pretreat part of the sintering flue gas by using wet electrostatic precipitation technology and cool down the sintering flue gas by using water mist.

3. The sintering flue gas carbon monoxide circulation emission reduction method according to claim 2, wherein, Control the particle size, injection volume and injection frequency of the water mist in the wet electrostatic precipitation technology according to the pollutant concentration and temperature in the sintering flue gas.

4. The sintering flue gas carbon monoxide recycling and emission reduction method according to claim 1, characterized in that, S1 includes: Catalytically reduce the remaining sintering flue gas to reduce the carbon monoxide and other pollutant concentrations therein, and calculate the catalytic oxidation efficiency; Recover the carbon monoxide in the sintering flue gas through gas separation technology and re-inject it into S2 as fuel supplement.

5. The sintering flue gas carbon monoxide recycling and emission reduction method according to claim 4, characterized in that, Detect the sintering flue gas after catalytic reduction, and when it meets the environmental protection requirements, discharge the remaining sintering flue gas.

6. The sintering flue gas carbon monoxide circulation emission reduction method according to claim 1, characterized in that, S2 includes: Inject pure oxygen into the sintering flue gas to promote the combustion of unburned carbon monoxide and other combustible components in the sintering flue gas, and at the same time increase the flue gas temperature.

7. The sintering flue gas carbon monoxide recycling and emission reduction method according to claim 1, characterized in that S3 includes: Guide the sintering flue gas after oxygen-enriched combustion treatment into a waste heat recovery device to realize the recovery and utilization of heat energy.

8. The sintering flue gas carbon monoxide circulation emission reduction method according to claim 7, characterized in that, After oxygen supplementation, the increased heat energy E of the circulating flue gas recycle，oxygenated is calculated by the following formula: Among them, E thermal is the thermal energy increment; m start and m end respectively represent the starting mass and the ending mass for calculating the thermal energy increment; C p is the specific heat capacity of the flue gas, indicating the heat absorbed by a unit mass of flue gas when its temperature rises by 1 degree Celsius; T final (m) and T initial (m) respectively represent the final temperature and the initial temperature of the flue gas at mass m.

9. The sintering flue gas carbon monoxide recycling and emission reduction method according to claim 4, characterized in that The calculation formula of the catalytic oxidation efficiency is as follows: Among them, η CO，oxidation is the catalytic oxidation efficiency of carbon monoxide in the flue gas for emission reduction; V emit is the volume of the flue gas discharged after catalytic oxidation treatment; [CO] emit is the concentration of carbon monoxide in the discharged flue gas; V in is the volume of the flue gas input into the catalytic oxidation device; [CO] in is the concentration of carbon monoxide in the input flue gas; k is the reaction rate constant of the catalytic oxidation reaction; A is the contact area between the flue gas and the catalyst; t is the time of the catalytic oxidation reaction; V react is the reaction volume of the catalytic oxidation reaction; η CO，oxidation The closer the value of η is to 1, the higher the catalytic oxidation efficiency of carbon monoxide and the better the emission reduction effect.

10. A sintering flue gas carbon monoxide recycling and emission reduction system, characterized in that, For implementing the sintering flue gas carbon monoxide cyclic emission reduction method described in any one of claims 1-9, the system includes, A wet electrostatic precipitation device, an oxygen-enriched combustion device, a waste heat recovery device, a catalytic reduction device and a gas separation device; A control system for dynamically adjusting the working conditions of the wet electrostatic precipitation device, the oxygen-enriched combustion device and the catalytic reduction device according to the real-time parameters of the flue gas discharged from the sintering machine to optimize the emission reduction effect and the heat energy recovery efficiency; A monitoring device for real-time monitoring of the concentration and temperature parameters of pollutants in the flue gas to ensure that the finally discharged flue gas meets the environmental protection requirements.

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